If a rain sensor stops irrigation when rainfall exceeds a threshold, what is the practical benefit?

• A. Conserves water by avoiding unnecessary irrigation.
• B. Increases irrigation during rain.
• C. Reduces filter maintenance.
• D. Improves pump efficiency.

Answer: (A)

The key idea is that a rain sensor protects water use by turning off irrigation when it’s raining or after rainfall reaches a set level. The practical benefit is conserving water by avoiding unnecessary irrigation once the soil has been wetted by rainfall. This prevents overwatering, reduces runoff and potential nutrient leaching, and aligns watering with actual need rather than a fixed schedule. The other ideas don’t fit because increasing irrigation during rain wastes water, while the sensor’s main payoff is water savings, not maintenance or pump efficiency.